Floating chuck for tapping machines



April 18, 1933. w. D. RIGNEY FLOATING CHUCK FOR TAPPING MACHINES Filed July 11, 1930 H m .m e

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WWIYSOM/W ATTORNEYs Patented Apr. 18,1933

p. sienna orroiza': 'eH s'r'ER, NEW Yomil Y'assmivoa ro ausssmi, 1 BUitDj;

' 'rro qorp m w YORK Application filedl'uly 1 1,

, This inventionrelates te ,chineslandis an improvement over the apsp f a s d r e aand, c ime y Pri Patent No. 1,147 ,267 granted July 20, 19 15. The. nut. tapping machine of mygprior 1nv nz cpmp a fl i g ap wh h s P- 7 sitioned bythe nut blanks passing over it and a, rotating chuck having an axially ar rangedpassage for {the nuts, in which the nuts are restrained against relative r0tat1on with respect to the chuck whereby the nuts tap and internally threaded.

are rotated over the tooling portion of the theblank contained in, anddrivenby it, will bein line with the center of the hole in the blank contained in and driven by the main .body portion of the chuck. The nut blanks are so spaced on the threaded. portion of the tap that each nut passes frorn'the main body portion into the floating chuckbefore; ;the .n extblank is pushed on to the-tap, a'ndfurther, that each blank passesiofi' of the thread- ..ed portion of the tap before the following nut" engages the 'Wear platesin the floating member. 1

vAHfurther feature of the invention isthe provision of wear plats intheagxial opening ofth'e chuck. Eachfplate is provided with a pressure surface which adapted to engage the "adj acent] side 1 of the nut blank substantially at" one of "the 'fcorners of the b1ankQ1 Because the plates engage thesides of the blanks instead of the corners, the latter' donot wear grooves injthe plates. v 1 In the accompanying drawing l have il- ,lustrated one form. of thelinvention. In this sn win t 1930. "s rial 1K0. 457,141.

Fig.3 isa detailed, sectionalview'on, Y

Fig. 2 is; an i end elevation Jof the.

3-3 of Fig.

manner described and claimed in my? prior patent referred to above. 5 F017 simplicity; of.

R er i ;1 0t q iaai iignth e ri c numeral '1 designatesggenerally a tap which m ybe supported by theg'nut blanksfin-the u illustration'thev supporting means forr the tap is not illustrated lhetap is pro'vided Y with'ga tooling portion 2which may i have 1 conventional relieved cutting threads. Tllle e5 threads are adapted to enter the hole of? the" I I nut blank to cut internal "threads therein in the usual mannen'g Beyond thetooling portion the shankfis reduced in crossvsection as at 3 so that the threaded nut blanks Will ifeed .along the; shank of the tap; more readily. s 3

' v described infinyipriorpatent the blanks are fedalong thetap means of a rotating chuck havinganamal openingin which the nut blanks are; held against; relativ .tation so that Jae the chuck and blanksare rotated together the threads i2: of .the tap feed thenut blank throughthe opening 5 in the chuck and cut the threads; Thefchuck i close c nsi-s s f ama n bodyipo s- .tion 4 which may ibe driven in anyfiuitable manner as by means of gear teeth 5Jon the periphery ot-thechuck-member adapted to mesh with a drivegear (not-shownya iiThe Y 7 main body member of the chuck is. recessed as indicated at 6. and: is provided With-a ci'rc'ularl flange at one-end thereof; 'Aflo'ating chuck-member 8 isadapted'to-be received 'inthisfrecessandis providedivvith' a plural- 6 ity of arms 1 91 arranged'; i Contact. with. outersurface of the flange Thesearmslare provided vvith openings or slots 10: adapted to receive studs 11which' arethreadedfand rivetedinto the flange 7. The.outer fendsf of thej'sthds' are threadedtiionlthe (reception of nuts 12 and washers 13 are. arranged between the nuts'andthe adjacent portion; of thearfrnfs' V i 9. ".Th slots. 0am, vvider than, the'st uds i511,

and thus permitmovementfotthe entirelmem the portion of the passage in the main chuck member .4 and similar wear plates 16 being arranged in the floating chuck member. As

shown, the wear plates are wedged shaped with the base portionsofthe wedgesmounted in suitable openings or recesses in the wall of the passage. The wear platestaper lon' gitudinally as indicated at 17 inFig. 3 of the drawing. These Wear platesare provided with pressure surfaces 18 which engage the sides'of the nut blank adjacent a corner thereof as shown in Fig. 2 of the drawmg. a

Any suitable means may beemployed for 'feedingthe blanks to the chuck as disclosed and'claimed in my prior patent. The blanks may be fed through a chute 19 to a position in alignment with the axial passage of the chuck and may then be delivered into the passage by a reciprocating member 20. This reciprocating member may be operated by "themeans disclosed in my prior patent or by any other suitable means.

The operation of the device will be ap parent from the foregoing description. The

passage 14 may be of anyshape that will prevent'relative rotation of the nut blank and chuck. It should be preferably larger than the blank to permit the circulation of water or other cooling fluid. A fluid such as water is preferably employed for cooling the tap as it also serves as a means for removing the chips formed in the threading operation. As the blanks are fed on to the end of the tap by the reciprocating member 20 and are rotated with respect to the'tap by the rotation of the chuck the cutting threads 2 of the tap propel the'blank along the tap longitudinally thereof and cutthe threads.

Where a one piece chuck is employed, nut blanks having out of center holes are apt to break the tap if two of them are located on the threaded portion atthe .same time. I By providing the floating chuck member 8, two such blankscan be located on the threaded portion of thetap at the same time without danger of breakage, because the blank in the floating member ca'n move until its hole is in line with the hole in the blank in the main body portion of the chuck. An important feature of the invention the arrangement of the wear plates 16 with their faces parallel to the sides of the nut'blank and adapted to engage the sides adjacent the corners, rather than the corners themselves.

I have found that this constructionreduces the tendency of the nut blanks to wear .in each member of said chuck at the same time. i

2;, Ina nut'tapping machine, a threaded tap and a revolving chuck arranged axially of said tap and having an axial passage shaped to prevent rotation of a nut blank relative to said chuck, said chuck comprising a driven member and a floating member cairrled by said driven memberwhereby a nut blank to (be threaded may be positioned in each member of said chuck at the same time, thewallsof the passage of said chuck being provided with wear plates. v 3. In a nut tapping machine; a threaded tap, a revolving chuck member havingan axial passage and a floating chuck member carried by said revolving chuck member and having an axial passage in alignment with said first mentioned passage whereby; a nut blank to be threaded maybe positioned in said revolving chuck memberand said floating chuck member at the same time,the walls of said passages being'providedf with wear plates adapted to engage the side walls of a nut blank adjacent a corner of the blank;

4. In a nut tapping machine, a threaded tap, a revolving chuck member having an axial passage, said passage being substantially' triangular in cross section, a floating chuck member carried by said revolving chuck member and having an axia'l 'pas'sage in alignment with the passage of'the chuck member, said passage being substantially triangular in cross section whereby a nut blank to be threadedmay be positioned in share- -'volving chuck member and said floating chuck member at the same time, and wear plates arranged in thewalls-ofsaid passages,

gage a side wall of a nut blank.

5. In a nut tapping machine, a threaded tap, a revolving chuck comprisinga driven member andafioating member carried by said driven member, saidfchuck being provided with an axial passage whereby nut blank to be threadedmay be positioned in each member of said chuck atthe .same time, and

wear plates arranged in each ofthe walls. of said passage, each of'said wear plates being provided'with'a pressure surface adapted to engage the side wall of a nut blank adj acent a corner thereof.

A PP gmach'ine am HUD each of the wear plates being adapted-to en 1 threaded tap, a main revolving chuck member having an axial passage, and a revolving floating chuck member having an axial passage in alignment with said first-mentioned passage, each of said passages being adapted to receive and rotate a'nut blank relative to the tapand to permit sliding movement of the nut blank along thewalls of the passages" as the nut blank is progressedby the threads of the tap, whereby the tap may simultaneouslyoperate upon one nut blank in the passage of the main chuck member and another nut blank in the passage of the floating chuck member. 1 a

7. ,A nut-tapping machine in accordance with claim 6, in which the main chuck mem-. ber has a recess in alignment with the axial passage and in which the floating chuck member 1s arranged in said recess.

8. A nut-tapping machine in accordance with claim 6, in which the main chuck member has a recess in alignment with the axial passage and in which the floating chuck member is arranged in said recess, and wear plates mounted in the walls of the passages in the two chuck members.-

9. A nut-tapping machine in accordance I with claim 6, in which the main chuck member has a recess in alignment with the axial passages, and in which the floating chuck member is arranged in said recess, each of the passages in said chuck members being sub-x stantially triangular in cross-section.

10. A nut-tapping machine in accordance with claim 6, in which the main chuck member is provided with a recess in alignment with the axial passage and in which the floating chuck member is arranged in said recess,

the facepf said chuck member beyond said recess belng provided with a flange, and arms carried by said floating chuck member and secured to said flange so as to allow motion of said floatingchuck member relative to the main chuck member.

In testimony whereof I aflix my signature.

WILLIAM' D. RIGNEY. 

